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| Mirrors > Home > MPE Home > Th. List > funcnv0 | Structured version Visualization version GIF version | ||
| Description: The converse of the empty set is a function. (Contributed by AV, 7-Jan-2021.) |
| Ref | Expression |
|---|---|
| funcnv0 | ⊢ Fun ◡∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fun0 6630 | . 2 ⊢ Fun ∅ | |
| 2 | cnv0 5869 | . . 3 ⊢ ◡∅ = ∅ | |
| 3 | 2 | funeqi 6583 | . 2 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 4 | 1, 3 | mpbir 234 | 1 ⊢ Fun ◡∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∅c0 4281 ◡ccnv 5655 Fun wfun 6555 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5253 ax-nul 5264 ax-pr 5396 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-mo 2567 df-clab 2742 df-cleq 2755 df-clel 2839 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4839 df-br 5107 df-opab 5172 df-id 5551 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-fun 6563 |
| This theorem is used by: f10 6884 pthdlem1 30385 0trl 30746 0pth 30749 |
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